Step 3.5 Flash 2603
StepFun · 1 configuration
Intelligence17.0
Input / 1M$0.10
Output / 1M$0.30
Context256K
Tariff: StepFun · Source: artificial-analysis · USD per million tokens
Thinking configuration
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Efficient frontier: best measured score at each cost1 measured configurations · 0 without both values
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StepFun flash model for efficient multimodal reasoning, coding, and tool use
Intelligence IndexArtificial Analysis composite index, not a percentage. Different versions of the index are not directly comparable.
17.0 pointsGPQA DiamondGraduate-level scientific questions. Measures specialist reasoning rather than web-search quality.
82.6 %Humanity’s Last ExamDifficult questions across many disciplines, compared under the same evaluation setup.
24.5 %τ²-BenchTool use and interaction in assistance scenarios. Does not replace an evaluation of your integration.
87.4 %IFBenchVerifiable instruction following. A proxy for precision rather than a benchmark of creative style.
66.5 %Omniscience accuracyFactual accuracy in Artificial Analysis's Omniscience evaluation.
24.6 %Specifications from the catalog
Inputtext
Outputtext
Tool callingYes
Structured outputYes
Speed135.1 tok/s
First token3.31 s
Maximum output131.1K
Catalog listing date2026-04-02